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1.symmetry n.对称；均衡（balanced proportions）
词根记忆：sym(共同)+metr(测量)+y--测量结果相同--对称；均衡
例：geometrical symmetries几何对称
派生词：symmetrical(a．匀称的：对称的)
2.sympathetic a.同情的(given to, marked by, or arising from sympathy, compassion or friendliness):(to)赞同的(approving)
词根记忆：sym(共同)+path（感情）+etic(…的)--有共同感情的--赞同的
例：a sympathetic person富于同情心的人//I was not sympathetic to what the author said jn his book.
3.symptom n．征兆（trace);(病）症状（something that indicates the presence of bodily disorder）
词根记忆：sym(共同)+ptom(现象)--共同的现象--症状
例：Forests in this area didn't show visible symptoms of damage by acid rain.//This medication can relieve symptoms of colds.
4.synchronize v.使同步（to make synchronous in operation）
词根记忆：syn(同)+chron(=time时间)+ize(使)--使同时间--使同步
例：Because of a similarity to dance, synchronized swimming-exhibition swimming in which the movements of one or more swimmers are synchronized with a musical accompaniment-is sometimes called water ballet, especially in theatrical situations.
派生词：synchronization(n．同步，同时性)
同根词：synchrony(n．同步)
5.syndrome n.综合症状（a set of medical symptoms which represent a physical or mental disorder)
词根记忆：syn(共同)+drome(跑)--（疾病）跑到一起--综合症状
例：Anyone who works with his hands for long hours can get carpal tunnel syndrome.
同根词：synthesize(v.综合)
6.synthesis n．综合：合成（integration, combination）
词根记忆：来自synthesize(v.综合：合成)
例：This project is a synthesis of hard work and patience.//The ribosome controls the rates of synthesis and degradation of RNA.
同根词：synthesize(v.合成)；synthesizer(n.音响合成器)；synthetic(a．合成的；人造的)
7.synthesize v.综合：合成(to combine or produce by synthesis)
词根记忆：syn(共同)+thes(放)+ize--放到一起--综合；合成
例：Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.
派生词：synthesizer(n.合成器；合成者)
同根词：synthetic(a．合成的：n．合成物)
8.synthetic n.合成物(sth. resulting from synthesis rather than occurring naturally);a．合成的(relating to or involving synthesis)
词根记忆：syn(共同)+thet(放)+ic--放到一起的--合成的
例：Farmers who switched from synthetic to organic farming last year have seen their crop yields decline.
派生词：synthetically( ad.综合地；合成地)
同根词：antithetical(a．对立的)
9.taboo a．讳忌的(banned on grounds of morality or taste);n．禁忌：禁止(prohibition)
发音记忆：“特不”--特别强调不准干的事--禁忌；禁止
例：Taboo topics from the 1930s are now discussed openly.//a taboo against sex before marriage婚前禁止性行为
n. 同情，怜悯
